Apparatus for metal drawing



Feb. 18, 1930. F. STACHELRODT 1,747,999 I APPARATUS FOR METAL DRAWING Filed Feb. 16, 1926 11/11/111 IIIIIIIIIII gnuentoz;

Patented Feb. 18, 11930 UNITED STATES PATENT OFFICE FRITZ STACHELRODT, OF FRANKFORT-ON-THE-MAIN, GERMANY, ASSIGNOR, BY MESNE ASSIGNMENTS, TO TRAHO METALLIC JOINT CORPORATION, OF NEW YORK, N. Y., A

CORPORATION OF NEW YORK APPARATUS FOR METAL DRAWING Application filed February 16, 1926, Serial No. 88,662, and in Germany February 24, 1925.

I This invention relates to apparatus for making connections between the ends of rods, tubes, wires, ropes and the like.

As described in United States Patent No. 1,599,356 of Alfred J. Auspitzer, issued Sept. 7, 1926, a tubular sleeve may be, secured to the end of a body such as a cable, or to the adjoining ends of two such bodies, by a drawing operation in which the metal of the sleeve is caused to flow into engagement with and along the metal of the body to which it is being aflixed. As therein described and illustrated, the apparatus for joining two bodies such as cables may take the form of a small draw machine in which a spindle is rotated to move the draw plate or plates. Devices of this general style may be madein any desired size and are particularly useful in securing terminal connectors or connecting sleeves to large size cables or the like.

The present invention is particularly adapted for use in connecting sleeves or the like to comparatively small bodies and for use in places which are not readily accessible or at which it is not convenient to attach or support a draw machine of the rotating spindle type.

An object of the invention is to provide a portable metal drawing device which may be su ported and operated by hand. More speci 'cally, an object is to provide a drawing device having two relatively movable members, one carryin a die and the other carrying a one-way c amp for drawing the sleeve through the die; both of these members being carried by the hand lever or levers which are used for effecting the relative movement of the die member and clamp member.

These and other objects of the invention will be apparent from the following specification when taken in connection with the accompanying drawings, in which- Fig. 1 is a central section through one embodiment of the invention, and illustrating a sleeve in position to be drawn upon the ends of two cables; and

Fig. 2 is a perspective view of the device.

In the drawings, the numeral 1 indicates the die plate orbase member, whichmember is provided with a seat for receiving the die 2, which die is preferably a split die. Fixed to the base member 1 are rods 3 which extend parallel to the axis of the die 2 and which guide the movable plate or draw head 4. The movable plate 4 is yieldingly pressed against the relatively fixed base member 1 by springs 5 which are coiled about the guide rods 3, and areseated against adjustable nuts 6.

The movable plate is provided with a oneway clamp which, as illustrated, comprises a pair of members 7, 7 which have outer conical surfaces contacting against the wall of a conical seat 8 formed on the movable plate. The

clamp members 7, 7 have some play axially of the seat 8 and are retained within the seat by a cover strip 9 which. is positioned between the movable plate 4 and the adjacent ends of the springs 5. Hand levers 10 extend into slots 11 in the base member 1 and are mounted on pivot pins 12. Short cam ends 13 of the handle levers bear against the movable plate 4 and force the movable plate and the base member 1 apart as the handle ends of levers 10 are moved toward each other.

As shown in Fig. 1, the device may be used for connecting the adjacent ends of bodies such as cables 14, 14' by means of a sleeve 15. To effect such a connection the ends of the bodies are slipped into the sleeve 15, which sleeve is provided with a reduced end portion 15. When the bodies 14, 14' are short members, the sleeve 15 may be introduced into the drawing device, with the I reduced end portion 15 between the clamping jaws 7, before the bodies 14, 14 are inserted in the sleeve. This operation is not essential, however, as the relatively movable members 1 and 4 and the cover strip 9 are slotted, as at 16, to permit the insertion into and removal from the device of relatively long cables.

When the parts are positioned with the reduced end 15'of the sleeve between the clamping jaws 7 the outer ends of'the handle levers 10 are moved toward each other, thus causing the cam ends 13 to separate the base member or die plate 1 and the clamping plate 4. As this. movement is initiated the jaws 7 are forced into contact with and grip the end of the sleeve and the separation of the members therefore draws the sleeve through the die 2. The throw of the cam ends 13 is comparatively short and only a short .tlrawing operation results. Upon separating the ends of the levers 10, the springs 5 force the movable plate 4 toward the die plate 1. During this movement, the stressed condition of that portion of the metal which is within the die 2 holds the parts of the die from movement with respect to the sleeve or the die plate. The clamp is released since the draw plate 4 moves away from the split cone members 7 and allows them to slide along the previously drawn portion of the sleeve. By continuing the manipulation of the hand levers 10, the sleeve is drawn down by a series of these short drawing operations.

The device may be used in various operations for drawing down relatively small or very ductile metals but is particularly adapted for the above-described operation of drawing sleeves down upon and into firm interengagement with the ends of small bodies such as cables. By this term is meant not a only flexible stranded cables, but rods, wires,

tubes or the like. No definite limit can be stated as to the maximum size of the sleeves which can be conveniently drawn with a device of this type, as the power required for drawing down the sleeve will of course depend upon the ductility of the sleeve and the amount of deformation required to effect the attachment to the particular body such as a cable. A light weight and easily manipulated device can be used for connecting the ends of bodies having a cross-section area of the order of 10 square millimeters or less or bodies having a diameter up to about 4 millimeters.

It will be evident that the invention may be embodied in a device of comparatively large size, and in that case it may be desirable to provide some means for securing the base member to a work bench or other support. The invention is intended primarily, however, for use as a hand tool as apparatus of small size may be used by a lineman working on a pole, tower or roof, or in other positions which are not readily accessible and in which it is not convenient to support a draw machine of the rotating spindle t e. The method of drawing down the sleeve y a succession of manually applied ca'm actions permits the drawing on of relatively long sleeves since each stroke of the device requires a small applied force as the power arm of the device is much greater than the work arm. Other forms of cams, racks or levers may be substituted for the operating handles and cams, and if. desired the return movement of the clamping plate or draw head may be made by yielding devices other than coil springs, or it may be positively effected by the operating mechanism. These and many other changes which may be made in the various parts, their relative size, shape and relation, fall Within the scope of my invention as set forth in thefollowing claims.

I claim:

1. Apparatus for drawing a sleeve or the like, comprising a pair of relatively movable members, a die carried by one member, means on the second member for releasably gripping the sleeve or the like, said gripping means being constructed and arranged to grip the sleeve as said members move apart and to release the sleeve as said members approach each other, and means for forcing said mem bers apart. 2. Apparatus for drawing a sleeve or the like upon the ends of bodies such as small cables, said apparatus comprising a pair of members having respectively a die and a sleeve clamp, means for moving said members towards and from each other, and means 0perable to lock said clamp tothe sleeve as the members separate and to release said clamp from the sleeve as the members approach each other.

3. Apparatus comprising a base member, a die-receiving seat on said member, a member carried by and movable with respect to said base member, a sleeve clamp on said movable member, means yieldingly pressing said members towards each other, a hand lever on one of said members and operable to separate the members, and means operable to release said sleeve clamp as the said members move towards each other.

4;. Apparatus for drawing sleeves upon and into intimate engagement with bodies such as small cables, comprising a base member, a movable member yieldingl urged towards said base member, a cam ever for moving said members apart, a die carried by said base member, and a releasable sleeve clamp carriedby said movable member, said clamp comrising a conical seat on said movable memer, and jaws movable axially of said seat to bring the same into and out of gripping engagement with a sleeve.

v5. Apparatus for drawing down a sleeve or the like comprising a base member, a movablemember carried thereby, manually operated means for forcing said members apart, spring means for forcing said members toward each other when said manually operated means is released, a die carried by one member, clamp elements carried by the other member, and means causing said clamp elements to grip a sleeve or the like as the members move apart and to release the same as the members move toward each other.

6. Apparatus as claimed in claim 5, wherein said movable member is carried by rods fixed to said base member, and said spring means are coiled around said rods.

7. Apparatus as claimed in claim 5, wherein the said clamp comprises split conical jaws mounted in a conical seat on said movable member, the taper of said conical jaws and,

seat being toward said base member.

' 8. Ap aratus for drawing a tubular connecting s eeve upon the ends of bodies such as cables comprising a pair of hand levers, a base member through which said levers pass and to which said levers are pivoted, a die carried by said base member, a plate carried by said base member and in engagement with the ends of said levers, s rings carried by said base member for yiel ingly pressing said plate to said member, a 'conicalseat on said plate and in axial alignment with the said die, and split cone clamping jaws cooperating with said seat to grip a sleeve as the plate and member are separated. y

In testimony whereof I aflix my signature. FRITZ TAGHELRODT. 

